<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Vue中的列表过渡</title>
    <script src="./js/vue.js"></script>
    <style>
        .v-enter, .v-leave-to{
            opacity: 0;
        }
        .v-enter-active, .v-leave-active{
            transition: 1s opacity;
        }
    </style>
</head>
<body>
    <div id="root">
        <transition-group>
            <div v-for="item of list" :key="item.id">
                {{item.title}}
            </div>
        </transition-group>       
        <button @click="handleBtnClick">Add</button>
    </div>
    <script>
        var count = 0
        var vm = new Vue({
            el: "#root",
            data: {
                list: []
            },
            methods: {
                handleBtnClick: function(){
                    this.list.push({
                        id: count++,
                        title: 'hello vue'
                    })
                }
            }
        })
    </script>
</body>
</html>